import Vue from 'vue'
import VueRouter from 'vue-router'
import login from '../components/login.vue'
import home from '../components/home.vue'
import welcome from '../components/welcome.vue'
import users from '../components/user/users.vue'

Vue.use(VueRouter)

const routes = [{
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: login
  },
  {
    path: '/home',
    component: home,
    redirect: '/welcome',
    children: [{
        path: '/welcome',
        component: welcome
      },
      {
        path: '/users',
        component: users
      }
    ]
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // next()  放行    next('/login')  强制跳转

  if (to.path === '/login') return next()
  // 获取token
  const token = window.sessionStorage.getItem('token')
  if (!token) return next('/login')
  next()
})
export default router
